It depends on the rental company. From the Budget website:

What kind of deposit is required when I pick up my car?
Your deposit type and amount will vary by Budget location. In the U.S. for corporate-owned locations, a credit card hold of $300 or total estimated charges (whichever is greater) will be placed on your credit/debit card at the time of rental. It's perfectly fine if you choose not to return the car on or before your schedule return date, but we will place up to three additional holds on your card (depending on how long you keep the car) to cover expected rental charges. Upon your return of the car, all holds will be released, and the actual cost of the rental will be charged. Please note that your bank may take up to two weeks to post the released credit hold to your card. Unfortunately, we cannot be held responsible for any returned checks due to debit card hold processing.

Canadian rentals require a credit card hold of $375 CAD for the first day, and $75 CAD for each additional day. Other countries and licensee-owned locations may vary.

To receive your quoted rate, some airport locations also might require you to present your airline ticket or boarding pass when you pick up your car. For full details, be sure to read the helpful terms and conditions that appear on steps 3 and 4 in the online reservation process and on your reservation confirmation page and/or e-mail.